Features: It can fix the antilost locator to the hole of the bicycles bottle cage to track and locate your car to prevent thefts. Comes with antitheft screws and special wrenches, which cannot be removed with traditional tools. Designed for easily installation. Simply attach it to water bottle holder using the included screws and you're ready to go. Firmly fixed in it, without shaking and causing abnormal noise. Suitable for most standard water bottle cages, making it suitable for a wide ranges of bikes. Specifications: Component: Plastic Size: about 3.5x7.8cm/1.37x3.07inch Package Includes: 1pc Protective Cover note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.